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4.10.1 Operation features
The operation process of the GENBI function is divided into an acquisition part and a
suppression part.
(i) Signal acquisition process
The acquisition process checks for the occurrence of state changes in each BI circuit. If a
state change is detected, the acquisition process determines the direction of the state change
and observes the time that the state change occurred. Figure 4.10-2 outlines the signal issuing
on the BI circuit (BI1) at the IO#1 slot of the IED; the BI1-CPL signal† is transferred for the
GBI01 scheme in the GENBI SLOT1 function; the function generates “SLOT1 GBI01_STATE
(580001 0010001001)” signal in Boolean form; it consists of “time stamp information” and
“quality information”.
Status detection about the BI1 at IO#1 slot
Binary input circuits (BIs)
Operation logic in GENBI function
Figure 4.10-2 Signal flowing at BI1 at IO#1 slot
†Note: The BI1-CPL signal is connected with the GBI01 function. For more information,
see chapter
Technical description: Binary IO module.
(ii) Event suppression process
When the signal switches between the “On” and “Off” state frequently over a short period of
time, the GENBI function will receive these repetitive signals. When these repetitive signals
are converted into event information, repetitive events are issued on occurrence of the
repetitive signals. The event suppression function is provided to suppress event appearance
when the GENBI function determines that the signal is being generated repetitively.
Event No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
Figure 4.10-3 Example of signals and events suppressed by setting
Figure 4.10-3 illustrates the case where a device produces repetitive signals. From this
figure, it can be seen that the start of event suppression occurs at the tenth state-change (point
B) because the GENBI function counts the number of state-changes. The GENBI function
detects the commencement of the signal repeated from the signal initiation point ‘A’. Scheme
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